<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>圆角边框</title>
		<style>
			#d1{
				height: 200px;
				width:400px;
				background-color: brown;
				border-radius: 5px 20px 50px 100px;
			}
			#d2{
				height: 400px;
				width:400px;
				background-color: brown;
				border-radius: 50%;
			}
			#d3{
				height: 200px;
				width:400px;
				background-color: brown;
				border-radius: 50%;
				box-shadow: 15px 15px 1px red, -15px -15px 2px darkcyan;
			}
			#d4{
				height: 400px;
				width:400px;
				background-color: green;
				border-radius: 100% 0 0 0;
			}
		</style>
	</head>
	<body>
		<div id="d1"></div>
		<div id="d2"></div>
		
		<div id="d3"></div>
		
		<div id="d4"></div>
	</body>
</html>